Solar Air Heater Build

   / Solar Air Heater Build #1  

forgeblast

Elite Member
Joined
Apr 23, 2005
Messages
3,791
Location
nicholson, pa
Tractor
John Deer 318
Solar heaters.
I have to thank garygary for all his help. He really walked me though some areas where I was stuck.
Parts list
2- 4x8 sheets of plywood
4-2x6x12 pt lumber
2-2x4x12 pine
2-4x8 sheets of Twin Wall Polycarbonate Sheets
Twin Wall, 8mm Clear - GEMPLER'S
4-12 sealing strips for the polycarb
Aluminum tape
Silicon
Spray foam
High heat paint black
Aluminum screen in grey
Brown soffit painted with high heat paint
4 red oak vent covers Whittington Wooden Wall Return | Signature Hardware
4 Back draft Damper (I wanted a silent one not a metal one that we could hear) Whole house cooling fans, attic ventilation, exhaust fans, bathroom fans
2 Panasonic fans model fv-08wq1 venting fan, whisper quiet Panasonic FV-08WQ1 | Extra Quiet Bath Exhaust Fans | Westside Wholesale had it for the cheapest almost 70.00 less then anyone else.
2-4x8 sheets of polyisocyanurate insulation
2 tubes of foam glue
1 adjustable hole cutter (hard finding an 8鋳 bit)(ebay had it)

Cut the 2x6 down and attach to the plywood. Seal with silicon. Attach the insulation to the box you have just made. Seal with silicon. Once cured paint with high heat paint.
Cut the pine into 1x2 strips and paint with high heat paint. Fit into the box but do not attach yet. Cut the soffit down and paint (I made the soffit 2鋳 longer then needed so that I could cut and attach it to the box. Next check out the wiring and plan for your cuts.
Mark out studs. Cut and then attach the boxes. Put in the fan, duct, and damper. Add the wooden grill. I ran the cords to a light switch so that I can turn them on and off (that was the plan anyway).

What changed was, I was worried about this actually working and I was also worried about the thermal protection that the fan had (if it hits 94 degrees it turns off). So my plan instead of putting four holes in the wall, I decided to use a movable system so that in the summer time, I can put the boxes away when I put the ac in.
I cut another sheet of polyisocyanurate insulation to fit my double window. I then installed the fan and back draft protection (see above). I used two sections of insulation one on the inside and one on the outside to create a better insulation barrier. I also taped the insulation down using aluminum tape(on the outside). I then used 8鋳 insulated flex ducting to run the inlet and outlet. I kept the holes in the same places that I would have put them if/when mounting them permanently on the house. I tilted the panels back and put in another back draft device on the outlet so that I did not have a nighttime heat sink.
I then used some L brackets to hold the boxes to the deck and also put a piece of 2/4 under the boxes to keep them from sliding.
I want to enclose the sides of the boxes to trap any heat from escaping.
On a sunny day wow the heat carries. The LP heater is off and it heats the house. With the amount of ducting and size of the boxes the fans work great, quiet too.
The only problem is that new insulation smell. Hopefully it goes away quick. Now I
can plug in the fans before I go to work and turn them off when I get home.

Over all it痴 a fun project. I want to put handles on the sides and may put wheels on the sides so I can move them in the summer. I think that we may go to a full install by next year, I feel better cutting the house if I keep getting the same results and the smell goes away


dec2011tby009.jpg

shows the insulation, fans, dampers from the inside

dec2011tby010.jpg

Shows how I set up the fans to come through the window


dec2011tby013.jpg

Screen in place

dec2011tby014.jpg

Soffit

dec2011tby012.jpg

Panel with screen and soffit in place just needs the green house panel.

dec2011tby011.jpg

Finished heater panel

dec2011tby015.jpg

Panel in place

dec2011tby016.jpg

Close up of the duct work. I know I am sacrificing some efficiency but I wanted to make sure it works before I put it in the walls.

dec2011tby017.jpg


You can see that the curtains hid it when not being used. The heat coming out is great I am pretty impressed with the system.
 
   / Solar Air Heater Build #2  
Great job, can you post more pics? I am not really sure what it looks like on the inside of the collector, and how the air flows. I really like these types of projects.........
 
   / Solar Air Heater Build #3  
That looks great. I'm going to look into this - this could be a nice addition to my shop - I'd like to insulate and heat it, just concerned about cost.
 
   / Solar Air Heater Build #4  
Great idea. Could you post the temps of the air that enters the heater and the air that exits the heater on a sunny day? It would be great if you could also provide the outside temp.

Anything special about the leaning angle?
 
   / Solar Air Heater Build #5  
Looking forward to more info from the OP?
 
   / Solar Air Heater Build #6  
So I assume the polyisosinate panels get attached to the plywood on back/bottom of the box, then painted, then the pine strips get the screening attached on top of this?

So the screening is the heat absorption medium? The fans then push from the inside and out the top side -then the soffit serves as the distribution into the pine "ducts" inside the box?

No thermostat just on/off switch I presume.

Ive been considering doing something similar for the barn but the metal roof puts 3'-4' snow banks on the front/south facing side where I would mount these.

Would you say a smaller half size - 4x4 could be effective?
 
   / Solar Air Heater Build #7  
Looks nice.
Garygary does some cool projects.
I keep saying I am going to do that when "I get around to it". Just never been able to find "around to it"
 

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